Paul,
What's your motivation for losing the bracket? The vendors sell a removable bracket which goes right across between the chassis rails. It is required to be able to remove the oil pan (along with the removable cross member).
You could replace the stock cable with two singles with independent adjustment, but as you say you would need to fabricate a cable sheath mount. This way you could probably get it closer to the e-brake handle, but it seems a lot of work for little gain.
Julian
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